Mounting means for electrical devices



June 15', 1948. A, HELGASQN 2,443,536

MOUNTING MEANS FOR ELECTRICAL DEVICES Filed March 6, 1946 9 fizaezzion I ci ia 4' kgaflojz/ 'Q QQMJDKJ Jim;

Patented June 15, 1948 MUUNTIN G MEANS FOR ELECTRICAL DEVICES Arni Helgason, Wilmette, Ill., assignor to Essex Wire Corporation, Detroit,

of Michigan Mich., a corporation Application March 6, 1946, Serial No. 652,317

1 Claim. 1

This invention relates to an electrical apparatus and particularly to small transformers, reactors, chokes and the like. Small transformers and similar devices for low power applications are customarily provided with means for mounting the same on a base or chassis as in the case of radio receivers.

The invention hereinafter described provides a simple and effective mounting construction for transformers and the like whereby such transformers may be secured in position on a base quickly and effectively without special tools. In addition, the invention provides a simple transformer bell having means integral therewith for mounting the transformer upon a base. A construction embodying the invention is desirable in that simple dies for fabricating the bells may be used. The assembly of a complete transformer with bells embodying the present invention simple and may be accomplished with a minimum of time and efiort. The same bells may be used with Various core thicknesses.

While the invention is susceptible to various modifications, one embodiment thereof is shown in the drawings wherein Figure 1 shows an isometric view of a transformer provided with bells embodying the present invention. Figure 2 shows the transformer of Figure 1 disposed in position upon a baseboard prior to locking. Figure 3 shows the transformer locked in position. Figure 4 shows a modified construction.

The transformer in general comprises a stack of laminations I!) of any shape, said laminations having suitable windings l2 with leads [3. The transformer stack and windings may be any one of a number of different types all well known in the art.

Disposed against one face of stack at is end bell is of pressed or drawn sheet metal. This bell is of the usual construction having a rim portion 16 around three sides and central portion l'l drawn out of the plane of rim 1 6 to accommodate windings.

The remaining face of stack I is provided with bell 20 having rim 2| around the three sides thereof corresponding to rim It and having cen tral bell portion 22 corresponding to bell ll. Flat rim 2| of bell 28 has opposing edges 23 and 2 bent to form retaining strips 26. Retaining strips 26 may be shaped as desired and preferably have tongue portions 2'! extending below stack 10. It is evident from Figure 1 that the bottom of stack I9 is that portion of the stack which does not have rim portions l6 and 2| on the end bells.

As shown here, strips 26 are narrow at the top of the transformer and taper to full width near the bottom of the transformer. Notches 28 may be out in strips 2d at the place where bending is to be efiected.

The two bells and stack may be maintained in assembled relation by suitable means passing through aligned apertures in the bells and laminations. Thus, as shown, rivets 30 may be threaded through the aligned apertures to maintain the assembly intact. Other means, such as bolts, eyelets or the like, may be provided.

The entire transformer may be mounted on base 3! by threading tongues 21 through suitable apertures provided in base 3|. When the transformer is in position, tongues 21 may be bent against base 3| to lock the transformer in place. Notches 28 make it possible to hold the transformer in position by twisting the tongues instead of bending them against a mounting plate.

Referring to Figure 4, a modified bell structure is shown wherein conventional apertured mounting lugs 2'! are provided. Thus, the transformer may be handled like any other transformer.

It is evident that, instead of one bell having strips 26 on opposite sides thereof, one strip may be on one bell, and the other strip may be disposed on the other bell. In that way, a single set of dies may be used for shaping the bells for a transformer.

By virtue of the above construction, the transformer stack and bells are maintained intact and not disturbed during the mounting of the transformer on a base.

What is claimed is:

A transformer comprising a stack of laminations and windings, the stack of laminations being coextensive on the top and bottom as well as on the opposite sides thereof, said stack having two faces in planes parallel to the planes of the lamina'tions and beyond which faces the windings normally extend, an end bell for said transformer at each face, each bell having a portion adapted to rest against a portion of the stack face, one of said bells having at least one lateral projection adapted to lie along one of the sides of the stack so that both bells together embody lateral projections adapted to embrace at least part of the opposite sides of the stack, said projections normally extending perpendicular to a transformer mounting surface, said projections having integral mounting lugs extending beyond the bottom of the transformer, said windings having leads extending beyond the bottom of the transformer, and said lugs functioning a a sup- 3 4 porting means for retaining the transformer in UNITED STATES PATENTS position on a mounting surface plate by the penetration of said lugs through apertures in the Number e Date mounting plate for subsequent distortion, and 1,6 3,832 Bohlman et a1 Oct. 19, 1925 said mounting plate having in addition an open- 5 1,666,339 o e p 19 8 ing for receiving said lead-s therethrough. FOREIGN PATENTS ARNI HELTG'ASON. E

Number Country Date R F R N ES IT 205,013 Great Britain Oct. 11, 1923 The following references are of record in the '10 file of this patent: 

